Introduction

Question 1

What’s triple A in unit tests?

Answer 1

It’s a basic test structure. Every test has the same structure, which is: Assert, Act and Assert.

Question 2

What’s type safe on c#?

Answer 2

Means that the compiler guarantees the types you’re using within your app. This is not satisfied when you use “MyProperty” kind of access.

Question 3

What’s classic and constraint-based asserts on unit tests?

Answer 3

Classic matches the value, e.g: Assert.Equals(expected, actual). Constraint is based on a prose: Assert.That(1, Is.EqualTo(actualValue).

Question 4

What’s a lambda expression?

Answer 4

A nameless function.

Question 5

How to test a float value in c# / nunit?

Answer 5

Use the within method.

Question 6

One example of type safe assert and one regular

Answer 6

Use matches method for type-safe lambda expressions and Property(“MyPropName”) for a non-type-safe.

Question 7

What’s the four most common constraint assertions?

Answer 7

Is, That, Does and Has (for lists)

Question 8

Is it ok having multiple asserts in the same test?

Answer 8

Yes, if they are asserting the same behavior.

Question 9

How to comment out a code block?

Answer 9

ctrl + k + ctrl +c

Question 10

How to ignore a test in unit?

Answer 10

Use the Ignore attribute and define a reason message

Question 11

How to separate tests in tests or category? And how to filter them?

Answer 11

Using Category attribute. Ignore via visual studio or –filter in dotnet test

Question 12

What’s the basic test execution flow of the framework?

Answer 12

ctor, one-time setup, setup, test, tear down, one-time teardown and dispose

Question 13

What are the principles of good unit tests?

Answer 13

Fast, Repeatable, Isolated, Trustworthy and Valuable

Question 14

How to reuse the same test method but with different data?

Answer 14

Via TestCase attribute and defining the input values, then allowing the method below to receive the input values and the expected value.

Question 15

What’s data-driven-tests?

Answer 15

Is a way to test using different set of input values for the same test method.

Question 16

Can you assert the expected value outside the method?

Answer 16

Yes. Via ExpectedResult property within the TestCase attribute.

Question 17

How to centralize test case data?

Answer 17

By creating a class and method that returns an IEnumerable containing TestCaseData items. Then by specifying a TestCaseSource in the test method.

Question 18

In which cases combinatorial and sequential test cases are useful?

Answer 18

To test all sort of combinations of values and ensure they won’t raise an exception, for example.

Question 19

Is it possible to centralize test case data in files?

Answer 19

Yes, you can create a csv file and then create the logic to read it and generate TestCaseData itens.